Jerry p L.
It has a a 2006 5.3 with the 706 cylinder heads texas speed stage 1 low lift cam with springs and valve train with icon forged aluminum flat top pistons with valve reliefs with a little taller intake manifold
Raymond T.
To tell the truth, I'm pretty disappointed with my MAILORDER TUNERS experience...
Because I should have done it much sooner ! My little sleeper of a truck is fully awake now..... I always liked how it performed. With just a few power adders she was running pretty strong. But I never would have guessed how much more she had to give...... now that I let the tune masters @ MAILORDER TUNERS do their magic........ Holy Hell Ya!! Those gurus are BOSS ! They got my tune on point and crazy as it seems , it got done by mail. Simply amazing..... they got my truck in straight up Beast Mode.
So nice when the outcome is exactly what you where told it would be.
If you have been thinking about trying MAILORDER TUNERS out.... your going to be pissed you didn't do it sooner. These guys are the real deal, for real,real. My turn around time was a total of 3 days and that includes the day I sent it off...
One other bad thing about using MAILORDER TUNERS,,,,, Now most of my neighbor's hate me, but I'm lovin it.
So do yourself a favor and get MAILORDER TUNERS on your team.
Eric
My truck definitely runs a whole lot better thanks to mail order tune I will definitely be using them in the future of my next couple builds
Brandon p.
Had my truck tuned locally but just didn’t run as expected. Overnighted ecm to mailordertuner.com with my build info. 3 days later had it back & installed. Incredible difference. Truck runs awesome. Will use them for all my tuning going forward. Thanks!!
Jacob G.
Started right up and tune seems perfect.
Joseph G.
Tuners was just what I needed to get my build rolling
Justin M.
I installed a summit stage 2 cam in my 2003 4.8 Silverado and needed a tune. My ECM made it to Texas on a Wednesday morning and Casey called me to go over a few things about my truck and they shipped my computer that evening. I got it a couple days later and installed it in my truck. It fired right up and runs awesome! Sounds like a racecar just like Casey said it would!
Brandon B.
Sent in my ECU to mail order tuner and had them tune it and they had a very fast turn around. Got it back in and it drives awesome! And no more check engine light for the O2’s!
Matthew C.
Needed a custom tune to get my 1997 k1500 with a gen 3 5.3 ls swap up and running and the crew at mail order tuner did not dissapoint. My computer was retuned and on its way back to me the same day it arrived and they even called me with a couple questions to make sure everything was done right the first time. Great company would highly recommend for all tuning needs
Raymond S.
Excellent service, fast turnaround, works perfectly
juan r.
Great services externally fast turn around time. The only thing would be the need to up their packaging. I know it's the mail carriers fault but 1 bubble wrap envelope would protect my ECU from damage. It still works but it's damaged now.
Frank N.
Runs like a champ
